Whule I'm not overly optimistic, it is too early to state that the shock of Brexit hasn't brought about a re-think.

And, yes, a peripheral states coalition could be a way to obtain major changes, including rewriting the treaties. A strong, Europe-wide political movement could certainly help convince some governments.

"Dieu se rit des hommes qui se plaignent des conséquences alors qu'ils en chérissent les causes" Jacques-Bénigne Bossuet